Hello maintainers,

Emacs Lisp Package Archive (ELPA) now includes a package called 'corfu',
according to its documentation:

        Corfu enhances the default completion in region function with a
        completion overlay. The current candidates are shown in a popup
        below or above the point.  Corfu is the minimalistic
        ~completion-in-region~ counterpart of the
        [[https://github.com/minad/vertico][Vertico]] minibuffer UI.

Hence, this patch tries to add support for `completion-in-region' in
`notmuch-address-expand-name'.  By default, this behaviour is turned off
so that existing users can enjoy existing completion techniques.

Thank you,
Utkarsh Singh
-- 
Utkarsh Singh
https://utkarshsingh.xyz/
>From fdc88b81fef763f7d7dcdc899aa8e90482c574fa Mon Sep 17 00:00:00 2001
From: Utkarsh Singh <utkarsh190...@gmail.com>
Date: Tue, 8 Feb 2022 19:17:26 +0530
Subject: [PATCH] emacs: Add more front ends for address completion

Add support for address completion through completion-in-region.
* notmuch-address.el (notmuch-address-use-completion-in-region):
Introduce customizable variable to activate the new front end.
(notmuch-address-selection-function, notmuch-address-expand-name): Use
it.
---
 emacs/notmuch-address.el | 28 ++++++++++++++++++----------
 1 file changed, 18 insertions(+), 10 deletions(-)

diff --git a/emacs/notmuch-address.el b/emacs/notmuch-address.el
index 1a4cdda2..cfb56a3a 100644
--- a/emacs/notmuch-address.el
+++ b/emacs/notmuch-address.el
@@ -123,10 +123,10 @@ you should make sure it is not somewhere publicly readable."
 (defcustom notmuch-address-selection-function 'notmuch-address-selection-function
   "The function to select address from given list.
 
-The function is called with PROMPT, COLLECTION, and INITIAL-INPUT
-as arguments (subset of what `completing-read' can be called
-with).  While executed the value of `completion-ignore-case'
-is t.  See documentation of function
+The function is called with PROMPT, COLLECTION, INITIAL-INPUT,
+BEG and END as arguments (subset of what `completing-read' can be
+called with).  While executed the value of
+`completion-ignore-case' is t.  See documentation of function
 `notmuch-address-selection-function' to know how address
 selection is made by default."
   :type 'function
@@ -150,13 +150,19 @@ matching `notmuch-address-completion-headers-regexp'."
   :group 'notmuch-send
   :group 'notmuch-address)
 
+(defcustom notmuch-address-use-completion-in-region nil
+  "Use `completion-in-region' for address completion."
+  :type 'boolean
+  :group 'notmuch-send
+  :group 'notmuch-address)
+
 ;;; Setup
 
-(defun notmuch-address-selection-function (prompt collection initial-input)
-  "Call (`completing-read'
-      PROMPT COLLECTION nil nil INITIAL-INPUT 'notmuch-address-history)"
-  (completing-read
-   prompt collection nil nil initial-input 'notmuch-address-history))
+(defun notmuch-address-selection-function (prompt collection initial-input beg end)
+  (if notmuch-address-use-completion-in-region
+      (completion-in-region beg end collection)
+    (completing-read
+     prompt collection nil nil initial-input 'notmuch-address-history)))
 
 (defvar notmuch-address-completion-headers-regexp
   "^\\(Resent-\\)?\\(To\\|B?Cc\\|Reply-To\\|From\\|Mail-Followup-To\\|Mail-Copies-To\\):")
@@ -245,7 +251,9 @@ requiring external commands."
 		     (funcall notmuch-address-selection-function
 			      (format "Address (%s matches): " num-options)
 			      options
-			      orig)))))
+			      orig
+			      beg
+			      end)))))
       (if chosen
 	  (progn
 	    (push chosen notmuch-address-history)
-- 
2.35.1

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